Mr. F. Walker on some undescribeil Ceylon Insects. 371 



clypeo subcarinato incisuris duabus anticis, coxis femoribusque 

 rufis, bis apice nigris, alis fuscis, venis nigricantibus, stigmate 

 nigro. Mas. Gracilis, antennis apice rufis, pedibus piceis. 



Female. Black, very thickly and finely punctured. Antennae 

 subfiliform ; tips of the scape and of the flagellum reddish. Cly- 

 peus slightly keeled, with a notch on each side in front. Legs 

 moderately stout ; coxae and femora red, the latter with black 

 tips. Wings brown ; veins blackish, in structure much like those 

 of Polyrhachis milifaris ; stigma black. Length of the body 

 4 lines ; of the wings 8 lines. Male. More slender. Antennae 

 slender, red towards the tips. Legs slender, piceous. Length of 

 the body 3| lines ; of the wings 7 lines. 



Formica exundans. Mas. Nigra, elongata, scitissime punctata, 

 antennis piceis filiformibus corpore vix brevioribus, abdomine 

 longi-fusiformi, segmentorum marginibns pedibusque pallide pi- 

 ceis, alis cinereis, venis nigricantibus, stigmate nigro. 



Male. Black, elongate, very finely punctured. Antennae piceous, 

 filiform, nearly as long as the body. Abdomen elongate fusiform ; 

 hind borders of the segments and legs pale piceous ; scale of the 

 peduncle large. Wings cinereous ; veins much like those of the 

 preceding species ; stigma black. Length of the body 4 lines 

 of the wings 6 lines. 



Formica meritans. Mas. Nigra, elongata, nitens, pubescens 

 capite impresso, ore fulvo, antennis piceis filiformibus corpore 

 paullo brevioribus, metathorace elongato transverse impresso, seg- 

 mentorum abdominalium marginibus posticis rufis, pedibus piceis 

 longiusculis, alis nigro-fascis, venis stigmateque nigris. 



Male. Black, elongate, shining, pubescent. Head with an im- 

 pression between the ocelli and the base of the antennae. Mouth 

 tawny. Antennae piceous, filiform, a little shorter than the body. 

 Metathorax elongate, slightly impressed across the middle. Pe- 

 duncle of the abdomen conical. Hind borders of the abdominal 

 segments red. Legs piceous, rather long. Wings blackish brown ; 

 veins and stigma black, the former like those of jF. exercita in 

 structure. Length of the body 5 lines, of the wings 6 lines. 



Formica latebrosa. Mas. Testacea, antennis gracillimis, scapo 

 longissimo, metathorace laevi, abdomine nigro, petiolo testaceo, 

 pedibus longis debilibus, alis albis, venis stigmateque testaceis. 



Male. Testaceous. Antennae very slender ; scape very long, 

 slightly increasing in thickness from the base to the tip, much 

 more than half the length of the flagellum. Metathorax smooth. 

 Abdomen black ; peduncle and its node testaceous. Legs long, 

 slender. Wings white ; veins and stigma testaceous, the former 

 in structure like those of F. exercita. Length of the body 4 lines ; 

 of the wings 7 lines. 



Formica pangens. Mas. Testacea, scitissime punctata, capite su- 

 pra piceo, antennis filiformibus corpore valde brevioribus, scapo 



24* 



